Sgr A$^*$两百年前耀发的X射线偏振证据
高能天体物理现象
2023-08-02 v1 星系天体物理
摘要
银河系中心宿主着一个约400万太阳质量的黑洞（Sgr A），其目前非常宁静，光度比活动星系核低许多个数量级。来自Sgr A的X射线被银河系中心区域致密气体反射，为研究其在数百年和数千年时间尺度上的过去耀发活动提供了手段。从Sgr A附近巨分子云观测到的X射线连续谱形状和强荧光铁线均与反射情形一致。若此解释正确，反射的连续谱辐射应是偏振的。本文报道利用成像X射线偏振探测器（IXPE）在银河系中心分子云方向上观测到的偏振X射线辐射。我们测得偏振度为31\% 11\%，偏振角为48 11。偏振角与Sgr A为该辐射主要源相一致，而偏振度意味着约200年前Sgr A的X射线光度曾短暂地与一个Seyfert星系相当。
引用
@article{arxiv.2304.06967,
title = {X-ray polarization evidence for a 200 years-old flare of Sgr A$^*$},
author = {Frédéric Marin and Eugene Churazov and Ildar Khabibullin and Riccardo Ferrazzoli and Laura Di Gesu and Thibault Barnouin and Alessandro Di Marco and Riccardo Middei and Alexey Vikhlinin and Enrico Costa and Paolo Soffitta and Fabio Muleri and Rashid Sunyaev and William Forman and Ralph Kraft and Stefano Bianchi and Immacolata Donnarumma and Pierre-Olivier Petrucci and Teruaki Enoto and Iván Agudo and Lucio A. Antonelli and Matteo Bachetti and Luca Baldini and Wayne H. Baumgartner and Ronaldo Bellazzini and Stephen D. Bongiorno and Raffaella Bonino and Alessandro Brez and Niccolò Bucciantini and Fiamma Capitanio and Simone Castellano and Elisabetta Cavazzuti and Chien-Ting Chen and Stefano Ciprini and Alessandra De Rosa and Ettore Del Monte and Niccolò Di Lalla and Victor Doroshenko and Michal Dovciak and Steven R. Ehlert and Yuri Evangelista and Sergio Fabiani and Javier A. Garcia and Shuichi Gunji and Kiyoshi Hayashida and Jeremy Heyl and Adam Ingram and Wataru Iwakiri and Svetlana G. Jorstad and Philip Kaaret and Vladimir Karas and Takao Kitaguchi and Jeffery J. Kolodziejczak and Henric Krawczynski and Fabio La Monaca and Luca Latronico and Ioannis Liodakis and Simone Maldera and Alberto Manfreda and Andrea Marinucci and Alan P. Marscher and Herman L. Marshall and Francesco Massaro and Giorgio Matt and Ikuyuki Mitsuishi and Tsunefumi Mizuno and Michela Negro and C. -Y. Ng and Stephen L. O'Dell and Nicola Omodei and Chiara Oppedisano and Alessandro Papitto and George G. Pavlov and Abel L. Peirson and Matteo Perri and Melissa Pesce-Rollins and Maura Pilia and Andrea Possenti and Juri Poutanen and Simonetta Puccetti and Brian D. Ramsey and John Rankin and Ajay Ratheesh and Oliver J. Roberts and Roger W. Romani and Carmelo Sgrò and Patrick Slane and Gloria Spandre and Doug Swartz and Toru Tamagawa and Fabrizio Tavecchio and Roberto Taverna and Yuzuru Tawara and Allyn F. Tennant and Nicholas E. Thomas and Francesco Tombesi and Alessio Trois and Sergey S. Tsygankov and Roberto Turolla and Jacco Vink and Martin C. Weisskopf and Kinwah Wu and Fei Xie and Silvia Zane},
journal= {arXiv preprint arXiv:2304.06967},
year = {2023}
}
备注
24 pages, 5 figures, 4 tables, author's version of the paper accepted for publication in Nature